Ok... this feels like an amateur question, but I have to ask it: I bought new neoprene seals for my 61 CJ5 after dealing with a continuous leak after driving. I took the oil pan off and the rear main cap and removed the original seals, which were neoprene to my surprise, so someone else has been in there I assume. No I am going in and trying to put in the top seal with crank in place, i can barely even get it started. I loosen all the mains and the crankshaft barely budged. I loosen all the rod caps too to see if those are holding them up. Nothing there either. All I can assume is that the flywheel and clutch is holding the crank in place? I assume I am going to need to take the transmission off to drop the crank to get that top seal in? Any pointers, I thought I could do this with crank in place like my old 4.0L I6 Jeep TJ, but apparently not. Seal was from KaiserWillys, I assumed it would be good quality .